Legally I don't think you have met the legal requirements as setout in the law.
I think all you have is wishful thinking... using your logic all that is needed is to throw a wooden dowel inside the spring so the follower can't go to the bottom. The legislation is very specific... your methods are not in compliance with legislative requirements as listed earlier in the Thread.
Just my humble opinion...
Mark
The dowel mod is "easily reversible". If you have a rivet or epoxy used to keep the mag from being disassembled, or from having the block taken out, I believe it meets the letter of the law.




















































